var timeout;
var delay = 500;
var nbsubmenu = 0;


function init(){
    while (document.getElementById('submenuHN'+nbsubmenu))
	nbsubmenu++;
}

function show_horizonNav(id) {
    cancelHide();
    hideNav();
    if (document.getElementById(id))
	document.getElementById(id).style.display="block";
}

function hideDelay() {
    timeout = setTimeout('hideNav()',delay);
}
function cancelHide() {
    if (timeout) {
	clearTimeout(timeout);
    }
}
function hideNav() {
    for(i=0;i<=nbsubmenu;i++) {
	if (document.getElementById("submenuHN"+i))
	    document.getElementById("submenuHN"+i).style.display="none";
    }
}